老头子你看有灰机灰机有什么好看捏

This nickname plays on the repetitive structure of spoken language to create a playful sense of talking in circles or mimicking the sometimes circular nature of conversations, especially those that might happen between elderly individuals (symbolized by '老头子' meaning old man). The speaker starts by telling someone ('old man') to look at an airplane (grey/gray machine, 灰机 being internet slang), and then immediately questions why they should even be looking at it.